Options:
1. Texture map the image onto a 3D surface parallel to the display, then
tell the 3D graphics card to rotate and scale the surface! =)
2. Get a library that does it for you from www.libsdl.org/libraries.php
3. Do it yourself. There are lots of websites and books that talk about
it. You can probably figure it out yourself with some matrix
operations, too.
#2 is probably the most reasonable thing to do...
-Mark
On Tue, 11 May 2004, Jan W wrote:
> Hi all:
>
> Just a question:
>
> Has anyone used SDL_image to do scaling and rotation? If so, is there anything
> that I could use to do basic image manipulations? I am looking for code
> examples/basic theories so that I can start off down a (more or less)
> reasonable path...
>
> I had an application that used fltk_images and libtiff to open images. It was
> large, unwieldy, and unfortunately, a bit slow. SDL_image was a bit faster b/c
> (at least, this is what I _think_... I'm still such a noob) of the way that I
> allocated the buffer for the image:
> (img_w)*(img_h)*(sizeof(current_color_depth)). So if you had a 24bit depth
> color display, and a B/W image, I allocate enough space for a 24bit color...
> not the right thing... It would have been tough to recode (for some reason
> that I can't recall), so I decided to try something different...
>
> Now, SDL does the work for me, and just leaves me with a surface... awesome.
>
> So if anyone has any hints/tips/tricks/caveats on SDL surface manipulation, I
> would love any tidbits that might float my way... and if anyone is interested
> in seeing my code (yea, I have the coding style of an 8 year old), just don't
> laugh when you do.... (write me off list and I'll send a copy)
>
> --thanks
>
> jan
--
Mark K. Kim
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